What does the sentence "Hu doesn't eat minced meat" mean?

The most famous idiot emperor in the history of China was Sima Zhong, Emperor Hui of the Western Jin Dynasty. He was the second son of Sima Yan, Emperor Wu of Jin Dynasty. Because of the early death of his brother Sima Gui, he became the eldest son and became the Prince of the East Palace. At that time, the officials in charge of raising the prince in the East Palace knew that the prince was an idiot, but in order to maintain the inheritance system of the eldest son and his future status as an imperial envoy, they cooperated with Emperor Wu of Jin for a long time and concealed the truth. When Emperor Wu of Jin died, Sima Zhong ascended the throne as emperor, and for the sake of Emperor Jinhui, the truth of his idiotic dream could no longer be concealed. Once he went out to listen to frogs, he foolishly asked his attendants, "What's the matter with you? Is it private? " Are these frogs public or private? Hearing this, the attendants couldn't answer, so they had to perfunctory: "The official is in the officialdom, and the private is in the private field." Once, there was a famine in the whole country, and the people had no food and starved to death. The idiot emperor was very surprised after listening to the minister's report and asked the minister, "Since the people have no food, why don't they eat minced meat?" This absurd remark has become a joke through the ages. When the princes and ministers knew that Hui Di was an idiot, they all had ulterior motives: those who fought for power and profit, those who formed a clique for personal gain, and those who coveted the throne. Finally, the "Eight Kings Rebellion" broke out, which led to the invasion of the "Five Lakes", and the world was bustling and the lives were ruined. Hui Di himself became emperor in 17, and he died of poisoning. Soon, the Western Jin Dynasty perished.